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Prevalence of endemic MDR S. Typhimurium DT104 pulsotype. The PFGE profile of three S. Typhimurium DT104 isolates responsible for three clusters that occurred in 2001, 2005, and 2011 (red) was compared to the pulsotypes of S. Typhimurium DT104 NCTC 13348 (green) and 57 sporadic isolates (blue) of S. Typhimurium isolated in the past decade. DNA from all isolates was digested with XbaI, and the degree of genetic similarity is shown by the dendrogram at the left.
